Kristoff St. John is seen at the 44th NAACP Image Awards at the Shrine Auditorium in Los Angeles on Feb. 1, 2013. The actor, a longtime star on “The Young and the Restless,” was found dead Sunday, Feb. 3, 2019, in his Woodland Hills home. (Photo by Kevin Winter/Getty Images)

“Young and the Restless” star Kristoff St. John, 52, who played Neil Winters on the daytime drama for nearly 30 years, was found dead Sunday in his Woodland Hills home, and the cause of death is suspected to be alcohol poisoning, CBS2 and TMZ reported.

The LA County coroner’s office and St. John’s attorney Mark Geragos confirmed the death, CBS2 reported.

Officers were sent to the 23000 block of Morea Way about 2 p.m. Sunday, according to the Los Angeles Police Department. An autopsy was pending, police said.

An autopsy was conducted, but the cause of death was “deferred pending additional investigation,” coroner’s officials reported.

Law enforcement sources told TMZ.com that a friend of the 52-year-old actor went to check on him and found the body.

“We’re told there was no sign of foul play; however one source says alcohol might have played a role,” TMZ reported.

St. John was nominated for nine Daytime Emmy awards and won two for his role on the CBS soap opera. He also won 10 NAACP Image Awards.

Mikhaleva told Radar she last spoke to St. John on Saturday, one day prior to his death.

“He was (a) little bit sad because I’m in Russia,” she said, adding he wanted “to be with me always.”

He had three children, son Julian and daughter Paris with Mia. St. John, and daughter Lola with Nadal, according to Wikipedia.

Kristoff St. John and his ex-wife, boxer Mia St. John, lost their son, Julian, when he took his own life in 2014 while getting treatment at a mental health facility, TMZ reported. He was in his mid-20s.

The couple sued the facility for negligence, and the suit was settled.

Julian St. John was found dead with a plastic bag over his head in a bathroom at La Casa Mental Health Rehabilitation Center on Nov. 23, 2014, less than three weeks after he attempted to kill himself in the same way, according to his parents’ lawsuit. He was 24.

“The facility was aware of Julian’s history of suicidal ideation, but only placed him under one-on-one observation for approximately two weeks following his most recent suicide attempt,” the suit stated.

The St. Johns filed the lawsuit in May 2015, alleging that nurses and staff members regularly skipped mandatory checks and observations of their son, and that facility’s employees regularly falsified documents to cover up the neglect.

“Moreover, defendants’ employees made no attempt to prevent Julian from obtaining plastic bags after he tried to take his own life with one,” the suit says.

After their son’s death, Kristoff and Mia St. John founded the El Saber es Poder — Knowledge is Power — Foundation to battle mental illness.

Lola St. John, actor Kristoff St. John and Paris St. John attend the 10th anniversary celebration of “The Beatles LOVE by Cirque du Soleil” at The Mirage Hotel & Casino on July 14, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

According to TMZ, Kristoff St. John threatened to kill himself with a gun in 2017, near the anniversary of Julian’s death, and was placed on a 72-hour psychiatric hold.

The website also reported Monday that a source close to Kristoff told them the actor had checked himself into UCLA Medical Center in January for depression issues and had just been released within the last few days.

.@YRInsider has been my guilty pleasure for 20 years. This is just heartbreaking. Kristoff St. John’s character was so revolutionary because he & @victoriarowell represented the only black family on Y&R, the no. 1 soap. Kristoff is appreciated and will be sorely missed. https://t.co/dEeC4Ef5y9

I met Kristoff St John and walked away encouraged by how generous and kind he was to me, a newcomer in Soaps. I can’t imagine the heaviness those close to him are experiencing. Grateful for his work and all the ways he shared his heart with us through it. #YR

Kristoff St John was much more than just the Denzel of daytime, he was part of the first truly front-burner African American family on a long running soap. Remember them this way. #YR#KristoffStJohnpic.twitter.com/eGKbQFK8oq

i was not ready for this news about Kristoff St. John. I am truly heart broken right now, this man was my TV Dad for over 25 years. He was clearly still hurting from the lose of his son. Sometimes the pain is too much to bare. I will miss this man soo much! pic.twitter.com/sA4eHxDvgw

This Breaks my Heart: "Young and the Restless" Star Kristoff St. John Sadly Found Dead.Kristoff played my Grandson on Roots2, I love this kid. He was a wonder kid, a great actor and an awesome man. I'd spoken with him recently. I'm just devastated! #RIP Beautiful soul, miss you! pic.twitter.com/Vevsvqq38f

💔💔💔💔💔 I grow up watching #YR & I always loved the Winters brothers, the all family & of course Drucilla & Neil what a supercouple! Gosh It's just just so heartbreaking, I hope that he found peace now. RIP MR Kristoff ST JOHN, you will be missed ❤🙏 pic.twitter.com/FfpLgy1UjS

This is such sad news. I spent at least 20 years of my life watching the Young & Restless. One day soon we will treat mental health health as seriously as we take pretty much all physical health disease & prevention. #mentalhealthhttps://t.co/swTvxigxFj

You have to be a soap head to know how BIG Kristoff St. John is to soap history. Jessie, Angie, Neil, Olivia, Drucilla … this dude was "representation" before representation was a thing. I hope the Daytime Emmys give him a great send off. #KristoffStJohnpic.twitter.com/qvyj5zoFKU

Not my guy Kristoff St. John! Terrible news this morning. RIP. Thank you for your contribution to how black men are portrayed. You always embodied class, talent, and quality. I will miss seeing you do what you do on a daily. Mental health is no joke! #yrpic.twitter.com/Nb6OvbbEba

Kristoff St. John–I mean, he WAS black soap opera royalty–right up there with Debbi Morgan/Darnell Williams. Never watched one second of Y&R–I was DIEHARD AMC–but you just KNEW who KSJ was REGARDLESS. That's how impactful he was on the soap genre… #KristoffStJohn

Also, I don't have the words to articulate the shock of Kristoff St. John's passing. No matter where you are in life, if you were raised in a Black household you watched Y&R at some point in your life. 28 years of my life, I've seen him on this show. His death is surreal.